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   http://www.apache.org/licenses/LICENSE-2.0

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<html>
    <head>
        <meta charset="utf-8">
        <script src="lib/simpleRequire.js"></script>
        <script src="lib/config.js"></script>
        <script src="lib/perlin.js"></script>
        <meta name="viewport" content="width=device-width, initial-scale=1" />
    </head>
    <body>
        <style>
            html, body, #main {
                width: 100%;
                height: 100%;
                margin: 0;
            }
        </style>
        <div id="main"></div>
        <script>
            // gap usually appears when dpr is not an integer
            Object.defineProperty(window, 'devicePixelRatio', {
                value: 2.5,
                writable: false
            });
            require([
                'echarts'
            ], function (echarts) {

                var chart = echarts.init(document.getElementById('main'));

                // function normalDist(theta, x) {
                //     return 1 / (theta * Math.sqrt(2 * Math.PI)) * Math.exp(- x * x / 2 / theta / theta);
                // }

                var xData = [];
                var yData = [];
                noise.seed(Math.random());
                function generateData(theta, min, max) {
                    var data = [];
                    for (var i = 0; i <= 300; i++) {
                        for (var j = 0; j <= 300; j++) {
                            // var x = (max - min) * i / 200 + min;
                            // var y = (max - min) * j / 100 + min;
                            data.push([i, j, noise.perlin2(i / 40, j / 20) + 0.5]);
                            // data.push([i, j, normalDist(theta, x) * normalDist(theta, y)]);
                        }
                        yData.push(i);
                        xData.push(i);
                    }
                    return data;
                }
                var data = generateData(2, -5, 5);

                // console.profile('render');
                console.time('render');
                chart.setOption({
                    tooltip: {},
                    xAxis: {
                        type: 'category',
                        data: xData
                    },
                    yAxis: {
                        type: 'category',
                        data: yData
                    },
                    visualMap: {
                        // type: 'piecewise',
                        min: 0,
                        max: 1,
                        calculable: true,
                        splitNumber: 8,
                        inRange: {
                            color: ['#313695', '#4575b4', '#74add1', '#abd9e9', '#e0f3f8', '#ffffbf', '#fee090', '#fdae61', '#f46d43', '#d73027', '#a50026']
                        }
                    },
                    series: [{
                        name: 'Gaussian',
                        type: 'heatmap',
                        data: data,
                        itemStyle: {
                            emphasis: {
                                borderColor: '#333',
                                borderWidth: 2
                            }
                        },
                        progressive: 1000,
                        // silent: true,
                        // progressive: 0,
                        // progressiveThreshold: 30000,
                        animation: false
                    }]
                });
                console.timeEnd('render');
                // console.profileEnd('render');
            });

        </script>
    </body>
</html>